Used x:Reference in Button and ProgressBar ControlTemplates #3868
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Fixes #3814
Used x:Reference in Button and ProgressBar ControlTemplates to fix some binding errors.
The issue is that ElementName does a Runtime lookup of the element. At some moments in time or on freezable objects this does not work, because they are not available in the visual tree. Therefore within a ControlTemplate x:Reference can be used to do a compile time / load time lookup.
Note that because the lookup is compile time / load time this also has a small performance gain during load of the element.