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POWPF - How to detect when new Visual child elements are added?
 

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    <p>Based on some custom security settings, I alter window child controls to readonly and disabled. To accomplish this, I loop through child controls when the window loads. </p> <p>This works just fine. 99% perfect.</p> <p>In my window I have an ItemsControl whose content is based on a ComboBox. Change the ComboBox, the child controls in the ItemsControl are databound again. But, then security (readonly/disabled) is no longer true. </p> <p>Before you jump to the solution, I know I could handle the ComboBox changed event; but, I have many such boxes and wnt a generic solution to can apply at the window-level (think: base) no matter what my developers add to the window/form.</p> <p>My question (sorry for the long lead in) is, how can I detect when a new child is added to the window because of some dynamic activity like databinding? Is there a NewChildAdded event? Is there a DataBindingJustChangedThings event? </p> <p>There's gotta be something.</p> <p>If your solution includes a timer, you need not reply. My forms are too complex to handle that extra load - and the delay between ticks is too real of a security issue. </p> <p>You might be thinking, just make the outer-container readonly or disabled. But this has a negative effect on things like expanders, multi-line textboxes and listboxes. Such an approach is not grainular enough. Of course, it is where we started iterations ago.</p> <p>If your solution includes a style, you need to include how I can override your approach on a per-control basis. Some controls (like a checkbox) cannot be disabled as they have a purpose in the UI layout. </p> <p>Sorry for the constraints, but I plan to use the solution in production.</p> <p>Thank you.</p>
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    1. USJerry Nixon - MSFT
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