* The Splitter will then call that sibling Panel's {@link Ext.panel.Panel#collapse collapse} or {@link Ext.panel.Panel#expand expand} method
* to perform the appropriate operation (depending on the sibling collapse state). To create the mini-collapse tool but take care
* of collapsing yourself, configure the splitter with <code>{@link #performCollapse} false</code>.</p>
* The Splitter will then call that sibling Panel's {@link Ext.panel.Panel#collapse collapse} or {@link Ext.panel.Panel#expand expand} method
* to perform the appropriate operation (depending on the sibling collapse state). To create the mini-collapse tool but take care
* of collapsing yourself, configure the splitter with <code>{@link #performCollapse} false</code>.</p>