"Speed" <pavankumar.thiru@gmail.com> wrote in message
news:1163079320.390305.308140@k70g2000cwa.googlegroups.com:

> I have a custom designer derived from the parentcontroldesigner for a
> usercontrol. I derive another control from this user control, it
> compiles fine and when I put this control on to a form I get an error
> message saying that the "Invalid Cast Exception". So I am wondering y
> cannot we derive from usercontrols which have custom designers.
> The sample outline of the code is as:
>
> [Designer(typeof(CustomDesigner))]
> public class myusercontrol : UserControl
> {
> .....
> .....
> }
>
> internal class CustomDesigner:ParentControlDesigner
> {
> myusercontrol myc;
> public override Initialize(Icomponent component)
> {
> base.Initialize(component);
> myc = componenet as myusercontrol; //invalid cast exception.
> .......
> }
> }
>
> //derived control
>
> public class derivedfromMyUserControl : myusercontrol
> {
> ......
> }