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Measure/Arrange Of Grids with SharedSizeGroup

Posted By:      Posted Date: October 11, 2010    Points: 0   Category :WPF
1 down vote favorite

There seems to be a bit of an issue with two grids containing elements specified in a certain way, and the SharedSizeGroup.  Forgive the length, but it helps to demonstrate the problem visually.

A question on  StackOverflow asked why two grids with a SharedSizeGroup didn't resize to the same height when certain conditions were met (resizing a TextBlock in the right-side grid). I took his example and expanded it, because I suspected that it had to do with the Measure/Arrange cycle.

It turns out that it does, in fact, have to do with Measure and Arrange. Actually, it has to do with not doing a Measure. I feel that this may be at least an issue, if not a bug, but would like to have an explanation of the behavior.

Here is a quick overview of what happens (garish colors for demo purposes only).

Start Up
Both grids have three rows, each containing a TextBlock. The middle row is of SharedSizeGroup. The text of the middle row is bound to the ActualHeight of its TextBlock, with the initial Height p

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