thanks alot but  LayoutUpdated Event is called repeatedly many times even if the mouse over the grid

this event will be fired the sender and event args are null so I don;t want to save the column width

every mouse movements

Yes, in style you should use <EventSetter .. Handler= ... Event=.../>

Regarding the EventManager, it basically is the same thing as the EventSetter but without the style. If you want, you can create a style and hook up the SizeChanged event to that style. The other option is by EventManager:

EventManager.RegisterClassHandler(typeof(ValueEditor), ValueEditor.SizeChangedEvent, new SizeChangedEventHandler(e_SizeChanged));

The first parameter is what type you want to register an event to.

The second parameter is the actual event (as in the EventSetter)

Thrid parameter is the handler.

With EventSetter, this code would look like:

<Style TargetType="{x:Type igEditors: XamNumericEditor}">

<EventSetter Event="SizeChanged" Handler="e_SizeChanged"/>

</Style>

Let me know if you have questions on this.

Alex.

thanks I found answer for my second problem

it is so easy :

To match event handler to Style  by Code or By xaml

just use Event Setter

okay I 'm waiting for you code ?

thanks again Alex

thanks alot that's better

but could you clear the code more please

I think your code will help me both in size changed problem and in other problem : that how can I respond to GotFocus Event for XamNumericEditor that I put As Style for XamDataGridField so I can register the event

Am I right ?  [ sorry may be I opened another discussion problem]

Yes, this is a drawback, that is why I encourage you to submit this as a feature.

Another way around this is probably use SizeChanged event of the ValueEditor and handle the event just in cases that the field is being resized.

EventManager.RegisterClassHandler(typeof(ValueEditor), ValueEditor.SizeChangedEvent, new SizeChangedEventHandler(e_SizeChanged));

Alex.