The designer does not let you do this because probably you don't have a
Content control in your A.aspx.
At design time you can automaticaly add it with the context menu that
appears when you click on the contentPlaceHolder in A.aspx.
Ever you insert an asp:Content control in a page linked to a master, the
master content will be replaced with the content of this content control.
So, if you don't insert a content control, the master content will be taken.
Hope this will help you
Mario Vázquez
"ghostwolf" <yl***@roctec.com.hkescribió en el mensaje
news:et**************@TK2MSFTNGP04.phx.gbl...
Hi, I've created a Master Page and there is another page "A.aspx" which
links to this Master Page. But why I can't drag n drop the Control from
the
Toolbox to the "ContentPlaceHolder" in "A.aspx". As I know, the Master
Page
is as a template of other pages, that means, we can use this template to
create several pages with different details. Thus, it should be allowed to
me for putting different items in the A.aspx. Thanks in millions.