Subclassing Controls

[TheStripe]

Hello all,

Wondering if anyone has come across this problem I am having..

I am Subclassing a RadioButtonList to add some properties that I need. I am
building up
a table and adding to a placeHolder control. I also register an event
handler
just before finally adding MyRadioButtonLi st to a TableCell control.

On Page_load I call my method that adds a Table containing MyRadioButtonLi st
to the placeholder.

The strange part is, On the first page load, MyRadioButtonLi st Selects the
proper ListItem
I have specified in code. on all subsequent postbacks it selects the first
listitem in MyRadioButtonLi st. I have stepped through the code and
everything seems to be fine. However on the first postback the
SelectedItemCha nged event fires, and the first listItem is selected,
Contrary to what I have in code. And all subsequent postbacks have the first
item selected and no event fires.

Any Ideas?

Thanks Guys,
Robert.

[Martin Dechev]

Hi, Robert,

First, which methods of RadioButtonList do you override? Then, if you're
changing the values of the RadioButton's, it may be that you are breaking
the logic in the protected method IPostBackDataHa ndler.LoadPostD ata and you
will need to override it.

Second, you say:

I also register an event handler
just before finally adding MyRadioButtonLi st to a TableCell control.
Do you attach to the event on every Page_Load or only when IsPostBack is
false? Maybe this is the problem - you need to subscribe for the event on
every Page_Load.

Greetings
Martin
"TheStripe" <Th*******@yaho o1221x.com> wrote in message
news:c5******** ************@co mcast.com... Hello all,

Wondering if anyone has come across this problem I am having..

I am Subclassing a RadioButtonList to add some properties that I need. I am building up
a table and adding to a placeHolder control. I also register an event
handler
just before finally adding MyRadioButtonLi st to a TableCell control.

On Page_load I call my method that adds a Table containing MyRadioButtonLi st to the placeholder.

The strange part is, On the first page load, MyRadioButtonLi st Selects the
proper ListItem
I have specified in code. on all subsequent postbacks it selects the first
listitem in MyRadioButtonLi st. I have stepped through the code and
everything seems to be fine. However on the first postback the
SelectedItemCha nged event fires, and the first listItem is selected,
Contrary to what I have in code. And all subsequent postbacks have the first item selected and no event fires.

Any Ideas?

Thanks Guys,
Robert.

[TheStripe]

Morning Martin,

I subClassed the control to add a few public propertys that I am using
to pass around added information I need in the Selected Item Changed event.
I did not override any thing in the base class. Thanks for helping figure
this out.

"Martin Dechev" wrote:

Hi, Robert,

First, which methods of RadioButtonList do you override? Then, if you're
changing the values of the RadioButton's, it may be that you are breaking
the logic in the protected method IPostBackDataHa ndler.LoadPostD ata and you
will need to override it.

Second, you say:

I also register an event handler
just before finally adding MyRadioButtonLi st to a TableCell control.

Do you attach to the event on every Page_Load or only when IsPostBack is
false? Maybe this is the problem - you need to subscribe for the event on
every Page_Load.

Greetings
Martin
"TheStripe" <Th*******@yaho o1221x.com> wrote in message
news:c5******** ************@co mcast.com...

Hello all,

Wondering if anyone has come across this problem I am having..

I am Subclassing a RadioButtonList to add some properties that I need. I

am

building up
a table and adding to a placeHolder control. I also register an event
handler
just before finally adding MyRadioButtonLi st to a TableCell control.

On Page_load I call my method that adds a Table containing

MyRadioButtonLi st

to the placeholder.

The strange part is, On the first page load, MyRadioButtonLi st Selects the
proper ListItem
I have specified in code. on all subsequent postbacks it selects the first
listitem in MyRadioButtonLi st. I have stepped through the code and
everything seems to be fine. However on the first postback the
SelectedItemCha nged event fires, and the first listItem is selected,
Contrary to what I have in code. And all subsequent postbacks have the

first

item selected and no event fires.

Any Ideas?

Thanks Guys,
Robert.