LayoutRegion region = getRegion(panel);
BorderLayoutData data = (BorderLayoutData) getLayoutData(panel);
remove(panel);
CollapsePanel cp = (CollapsePanel) panel.getData("collapse");
if (cp == null) {
cp = createCollapsePanel(panel, data, region);
}
cp.clearSizeCache();
setCollapsed(panel, true);
switch (region) {
case WEST: