Fix the PaneVisible initialziation problem #1179
Merged
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Fix #595.
When PaneVisible=false in Xaml, visualstate is not updated to PaneCollapsed correctly.
UpdatePaneVisibility calls VisualStateManager::GoToState.
When PaneVisible = true before OnApplyTemplate, the visualstate change is ignored and didn't take into effect.
This fix just rerun UpdatePaneVisibility in OnApplyTemplate to fix the problem.