Fix tooltip management for hide/show button
diff --git a/bundles/org.eclipse.rap.gef/src/org/eclipse/gef/ui/palette/FlyoutPaletteComposite.java b/bundles/org.eclipse.rap.gef/src/org/eclipse/gef/ui/palette/FlyoutPaletteComposite.java
index 76f0335..98b38a9 100644
--- a/bundles/org.eclipse.rap.gef/src/org/eclipse/gef/ui/palette/FlyoutPaletteComposite.java
+++ b/bundles/org.eclipse.rap.gef/src/org/eclipse/gef/ui/palette/FlyoutPaletteComposite.java
@@ -1345,6 +1345,11 @@
 					if (evt.getPropertyName().equals(PROPERTY_STATE)) {
 						setDirection(getArrowDirection());
 						setToolTipText(getButtonTooltipText());
+						if (isInState(STATE_COLLAPSED)) {
+							sash.setToolTipText(PaletteMessages.get().PALETTE_SHOW);
+						} else {
+							sash.setToolTipText(null);
+						}
 					} else if (evt.getPropertyName().equals(
 							PROPERTY_DOCK_LOCATION))
 						setDirection(getArrowDirection());