RE: Event Bubbling and Templated Controls

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Hello Mark,

For your scenario, the two properties(SelectedValue and SelectedText) need
to be updated according to some sub controls(in a Template) which is not
predefined, I agree that there is no perfect means here which can either
let the user put whatever controls they like in the template and let our
main custom control correctly update the two properties depend on those
unpredictable child control's events.

So far what I can get are the following options:

** If your custom control is designed to only support limited type of
controls (such as ListBox and DropDownList or TextBox) to raise change
event so as to change the SelectedValue and SelectedText properties, I
think you can consider check the control type (by the source ) of the
OnBubbleEvent to determine whether you need to call function to update the
properties.


** Another means is that you add some additional properties, such as a
"ChilldID" string property and a "ControlType" property. You'll have to let
the users of your custom control to set these two properties. These two
properties indicate the ID of the control in the template whose postback
event need to trigger the changing of the SelectedValue and SelectedText
property, and the type of that control in template. Thus, in your control's
OnBubbleEvent, you can check the source control with the two additional
properties to determine whether to do the modification.

How do you think on this? If you have any other ideas or questions on
this, please feel free to post here.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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