"Faizan Ahmed" <faizan@edevtech.com> wrote in message
news:eAk6DtA7EHA.3360@TK2MSFTNGP10.phx.gbl...
> Hello All,
>
> I have yet another problem,
> I've derived a control from Datagrid,
>
> Now in the OnInit() method i Created a button control, added it to a
> HtmlTable and added the HtmlTable to my Composite control's Control
> collection.
>
> The heirarchy is something like this
> CustomControl C
> HtmlTable T
> Button B
> i.e.
> H.Controls.Add(B)
> C.Controls.Add(T)
>
> The render method of my control is as follows
>
> Protected Overrides Sub Render(ByVal output As
> System.Web.UI.HtmlTextWriter)
>
>
>
> MyBase.Render(output)
>
> End Sub
>
>
> This statement gives an error in DataGrid.PrepareControlHierarchy()
> method.
> If i remove HtmlTable from the control collection of my control then it
> works fine, but then the button control in the table does not raise any
> events.
>
> Can any one help??Mr. Saunders?

"Faizan Ahmed" <faizan@edevtech.com> wrote in message
news:%23OJiQyW7EHA.2032@tk2msftngp13.phx.gbl...
>
> "John Saunders" <johnwsaundersiii at hotmail.com> wrote in message
> news:uomdXTR7EHA.1112@TK2MSFTNGP14.phx.gbl...
>> "Faizan Ahmed" <faizan@edevtech.com> wrote in message
>> news:eAk6DtA7EHA.3360@TK2MSFTNGP10.phx.gbl...
>> > Hello All,
>> >
>> > I have yet another problem,
>> > I've derived a control from Datagrid,
>> >
>> > Now in the OnInit() method i Created a button control, added it to a
>> > HtmlTable and added the HtmlTable to my Composite control's Control
>> > collection.
>> >
>> > The heirarchy is something like this
>> > CustomControl C
>> > HtmlTable T
>> > Button B
>> > i.e.
>> > H.Controls.Add(B)
>> > C.Controls.Add(T)
>> >
>> > The render method of my control is as follows
>> >
>> > Protected Overrides Sub Render(ByVal output As
>> > System.Web.UI.HtmlTextWriter)
>> >
>> >
>> >
>> > MyBase.Render(output)
>> >
>> > End Sub
>> >
>> >
>> > This statement gives an error in DataGrid.PrepareControlHierarchy()
>> > method.
>> > If i remove HtmlTable from the control collection of my control then it
>> > works fine, but then the button control in the table does not raise any
>> > events.
>> >
>> > Can any one help??Mr. Saunders?
>>
>> I wouldn't add anything to a DataGrid which it is not expecting to find
>> there. After all, how would your control feel if some derived control
>> started playing with its Controls collection?
>>
>> Instead, you could just not add T, and change your Render method to:
>>
>> Protected Overrides Sub Render(ByVal output As
> System.Web.UI.HtmlTextWriter)
>> T.RenderControl(output)
>> MyBase.Render(output)
>> End Sub
>>
>> If you need the table to come after the DataGrid, you can put the
>> T.RenderControl after the MyBase.Render.
>>
>> John Saunders
>>
>>
>>
> But if i implement it this way i wont get any events raised by my control
> T(or its child controls B), because their viewstate wont be mantained by
> the
> Grid. I think this is a problem many people must've come across but i m
> not
> sure why there is no solution available for it, may be there is a
> straightforward way of doin such a think and i m moving in a wrong
> direction.
> I've been able to identify the cause of my problem; the
> PrepareControlHeirarchy() function of the DataGrid (which applies styles
> on
> the control)expects all of the new controls to be added at the end of
> controls collection.

"John Saunders" <johnwsaundersiii at hotmail.com> wrote in message
news:uomdXTR7EHA.1112@TK2MSFTNGP14.phx.gbl...
> "Faizan Ahmed" <faizan@edevtech.com> wrote in message
> news:eAk6DtA7EHA.3360@TK2MSFTNGP10.phx.gbl...
> > Hello All,
> >
> > I have yet another problem,
> > I've derived a control from Datagrid,
> >
> > Now in the OnInit() method i Created a button control, added it to a
> > HtmlTable and added the HtmlTable to my Composite control's Control
> > collection.
> >
> > The heirarchy is something like this
> > CustomControl C
> > HtmlTable T
> > Button B
> > i.e.
> > H.Controls.Add(B)
> > C.Controls.Add(T)
> >
> > The render method of my control is as follows
> >
> > Protected Overrides Sub Render(ByVal output As
> > System.Web.UI.HtmlTextWriter)
> >
> >
> >
> > MyBase.Render(output)
> >
> > End Sub
> >
> >
> > This statement gives an error in DataGrid.PrepareControlHierarchy()
> > method.
> > If i remove HtmlTable from the control collection of my control then it
> > works fine, but then the button control in the table does not raise any
> > events.
> >
> > Can any one help??Mr. Saunders?
>
> I wouldn't add anything to a DataGrid which it is not expecting to find
> there. After all, how would your control feel if some derived control
> started playing with its Controls collection?
>
> Instead, you could just not add T, and change your Render method to:
>
> Protected Overrides Sub Render(ByVal output As
System.Web.UI.HtmlTextWriter)
> T.RenderControl(output)
> MyBase.Render(output)
> End Sub
>
> If you need the table to come after the DataGrid, you can put the
> T.RenderControl after the MyBase.Render.
>
> John Saunders
>
>
>