WP7 usercontrol - change control width when orientation changes?

You should set the HorizontalAlignment and HorizontalContentAlignment to HorizontalAlignment . Stretch for the ListBoxItems which have your control. In addition, set the design width/design height of your control.

Where you are placing this control, that you are not mentioned . I think you are placing this control inside a Phone page ; like placing any other control. If so better you manage orientation related stuffs in that page( Container page ) instead of making adjustment in the control.

I Think this will solve your issue.

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