STORM-357 FIXED Gestures button is in the pressed state after drag-n-drop but...

STORM-357 FIXED Gestures button is in the pressed state after drag-n-drop but gestures list isn't visible.

- Because the Gesture Combo List isn't child of gViewerWindow->getNonSideTrayView(), after focus lost the gesture list becomes hidden under world.
  To avoid this, send child to front in each draw.