long getInstanceID() {
		return instanceID;
	}
XML Constructor!!!!!

@param name the name of the component
@param owner the owner of the component
@param group the window group
@param title the title
@param show whether or not the component is showing
@param node componentNode that has this placeholder
@param instanceID the instance ID
Ghidra/Framework/Docking/src/main/java/docking/ComponentPlaceholder.java