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Editorial Team
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Asked: 2026-05-13T01:40:56+00:00

I have a window, in which i have many controls, UserControls or controls derived

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I have a window, in which i have many controls, UserControls or controls derived from other controls (and grids and frames).

It works fine if i DON’T add any event to ANY of the controls i have in my window (in XAML). I have many other events that don’t cause this, but if i add a new event. It will crash.

Example:

This is the control i would like to add my event to:

<con:MyControl Content="Hello" Grid.Column="3" Width="90"/>

So, i change it into:

<con:MyControl Content="Hello" Grid.Column="3" Width="90" Click="Hello_Click"/>

The application compiles…

But then, this happens:

'Set connectionId threw an exception.' Line number '53' and line position '22'.

InnerException:

{"Unable to cast object of type 'System.Windows.Controls.Button' to type 'MyNamespace.MyClass.MyControl'."}

If i now remove

Click="Hello_Click"

It works perfectly fine!

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1 Answer

  1. Editorial Team

    I agree with Anurag. If you have a button elsewhere on your client that is hosting MyControl you may be able to attach the button event to your control by changing Click=”Hello_Click” to Button.Click=”Hello_Click”. But you would need to have a button further down the logical hierachy so its event could bubble up to your control. The error suggests that MyControl does not subclass Button.

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