How to make sure ComboBox select nothing...

[Programatix]

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available
selection.

If I make the ComboBox visible before setting the .SelectedText to "" and
the .SelectedIndex property to -1, it will be successful. But if I put the
ComboBox in a TabControl and I switch between the Tabs in the TabControl,
the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Juan C. Olivares]

Add an empty object to the combobox options :)

"Programatix" <pr*********@nospam.com> escribió en el mensaje
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available
selection.

If I make the ComboBox visible before setting the .SelectedText to "" and
the .SelectedIndex property to -1, it will be successful. But if I put the
ComboBox in a TabControl and I switch between the Tabs in the TabControl,
the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Herfried K. Wagner]

Hello,

"Programatix" <pr*********@nospam.com> schrieb:

I'm having problem with ComboBox. I'm trying to force the
ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select
the first available selection.

Try to call "myCombo.SelectedIndex = -1" twice, somethimes that helps.

Regards,
Herfried K. Wagner
--
MVP · VB Classic, VB .NET
http://www.mvps.org/dotnet

[Programatix]

What if I binded the ComboBox to a DataSource?

Thanks for the respond.

"Juan C. Olivares" <ju*****@TAGnet.org> wrote in message
news:eD*************@TK2MSFTNGP10.phx.gbl...

Add an empty object to the combobox options :)

"Programatix" <pr*********@nospam.com> escribió en el mensaje
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available selection.

If I make the ComboBox visible before setting the .SelectedText to "" and the .SelectedIndex property to -1, it will be successful. But if I put the ComboBox in a TabControl and I switch between the Tabs in the TabControl, the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Programatix]

It did, but as I have state, if I put the ComboBox into a TabControl and
switched between the Tabs in the TabControl, the ComboBox will reselect the
first available option.

I'm thinking of expanding the ComboBox by inheriting it but could not think
of a way to code it. Any idea?

"Herfried K. Wagner" <hi*******@m.activevb.de> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

Hello,

"Programatix" <pr*********@nospam.com> schrieb:

I'm having problem with ComboBox. I'm trying to force the
ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select
the first available selection.

Try to call "myCombo.SelectedIndex = -1" twice, somethimes that helps.

Regards,
Herfried K. Wagner
--
MVP · VB Classic, VB .NET
http://www.mvps.org/dotnet

[Ron McNulty]

I select the records into a dataset, then add a row with a description of
"<None>" and a value of DbNull.Value. Then I bind the combo box to that
dataset.

This lets users actually put a null in the database when appropriate. I
don't think your current efforts will achieve this.

Regards

Ron

"Programatix" <pr*********@nospam.com> wrote in message
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available
selection.

If I make the ComboBox visible before setting the .SelectedText to "" and
the .SelectedIndex property to -1, it will be successful. But if I put the
ComboBox in a TabControl and I switch between the Tabs in the TabControl,
the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Programatix]

That's a great idea. How come I never thought of that.
Thanks.

"Ron McNulty" <rm******@xtra.co.nz> wrote in message
news:Ov**************@TK2MSFTNGP12.phx.gbl...

I select the records into a dataset, then add a row with a description of
"<None>" and a value of DbNull.Value. Then I bind the combo box to that
dataset.

This lets users actually put a null in the database when appropriate. I
don't think your current efforts will achieve this.

Regards

Ron

"Programatix" <pr*********@nospam.com> wrote in message
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available selection.

If I make the ComboBox visible before setting the .SelectedText to "" and the .SelectedIndex property to -1, it will be successful. But if I put the ComboBox in a TabControl and I switch between the Tabs in the TabControl, the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Joe White]

Okay, here's kind of a crazy idea (but one that ought to work): Create
your own class that implements IList. In your class's constructor, take
a parameter of type IListSource; call IListSource.GetList(), and save a
reference to the IList that's returned. Then implement your class's
IList.Count property to return savedList.Count + 1, and have your
IList.Item property return "" for element 0, and otherwise return
savedList[index - 1]. Then create an instance of this class, passing
your DataTable as a parameter to the constructor; and bind your ComboBox
to this object, instead of directly to the DataTable.

Sounds like a bit of a pain, until you consider that you can then re-use
this same class for every combo box in your application...
Programatix wrote:

Ok, there's a problem. I'm using DataRelation. The child Table will use the
primary key column of the parent Table as the value. Since it's a primary
key, I cannot add a NULL value for it.

Sigh...

"Ron McNulty" <rm******@xtra.co.nz> wrote in message
news:Ov**************@TK2MSFTNGP12.phx.gbl...

I select the records into a dataset, then add a row with a description of
"<None>" and a value of DbNull.Value. Then I bind the combo box to that
dataset.

This lets users actually put a null in the database when appropriate. I
don't think your current efforts will achieve this.

Regards

Ron

"Programatix" <pr*********@nospam.com> wrote in message
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox

select

nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first

available

selection.

If I make the ComboBox visible before setting the .SelectedText to ""

and

the .SelectedIndex property to -1, it will be successful. But if I put

the

ComboBox in a TabControl and I switch between the Tabs in the

TabControl,

the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Claes Bergefall]

Sounds like you're binding to it
That causes problems with controls on tab controls

Read this:
http://noiseehc.freeweb.hu/CurrencyManager.html

Basically you need to add the following during the loading
of your form (tabpage is the one containing your combo)
tabpage.BindingContext = form.BindingContext
Also read this:
http://support.microsoft.com/?id=327244
/claes

"Programatix" <pr*********@nospam.com> wrote in message
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select
nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available
selection.

If I make the ComboBox visible before setting the .SelectedText to "" and
the .SelectedIndex property to -1, it will be successful. But if I put the
ComboBox in a TabControl and I switch between the Tabs in the TabControl,
the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.

[Programatix]

Mmmm, the article at http://support.microsoft.com/?id=327244 explain that
the bug is found in .NetFramework 1.0. Since I'm using .NetFramework 1.1,
this means that the bug is not fixed yet.

For the solution found in http://noiseehc.freeweb.hu/CurrencyManager.html,
I'll try it right away.

Thanks for the reference.
"Claes Bergefall" <cl********************@frontec.se> wrote in message
news:Ow**************@TK2MSFTNGP10.phx.gbl...

Sounds like you're binding to it
That causes problems with controls on tab controls

Read this:
http://noiseehc.freeweb.hu/CurrencyManager.html

Basically you need to add the following during the loading
of your form (tabpage is the one containing your combo)
tabpage.BindingContext = form.BindingContext
Also read this:
http://support.microsoft.com/?id=327244
/claes

"Programatix" <pr*********@nospam.com> wrote in message
news:uX**************@tk2msftngp13.phx.gbl...

Hi,

I'm having problem with ComboBox. I'm trying to force the ComboBox select nothing by doing this,
myCombo.SelectedText = ""
myCombo.SelectedIndex = -1
but in vain, as the ComboBox will automatically select the first available selection.

If I make the ComboBox visible before setting the .SelectedText to "" and the .SelectedIndex property to -1, it will be successful. But if I put the ComboBox in a TabControl and I switch between the Tabs in the TabControl, the ComboBox will automatically reselect the first available selection.

Anyone out there has a solution?

Thanks in advance.