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Fixes to avoid "no Parent-Window" exception

Please change following code to avoid above exception unter some circumstances:


TElPageControl.ChangeActivePage -> Add "if HandleAllocated then" bevore Realign
TElPageControl.IntMouseDown -> Add try..except around SetFocus
TElPageControl.IntLButtonUp -> Add try..except around SetFocus
TElPageControl.RecalcTabPositions -> Change "if HasVP then" to "if HasVP and HandleAllocated then"


TElTreeItem.RedrawItemPart -> Add "if FOwner.FView.HandleAllocated() then" bevore InvalidateRect
TElTreeItem.RedrawItem -> Add "if FOwner.FView.HandleAllocated() then" bevore InvalidateRect



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