CComponentsItem: move function isAdded() to CComponentsItem class

Origin commit data
------------------
Commit: 3438b23f68
Author: Thilo Graf <dbt@novatux.de>
Date: 2013-10-19 (Sat, 19 Oct 2013)

src/gui/components/cc_item.cpp

@@ -151,3 +151,12 @@ int CComponentsItem::getItemType()
 #endif
 	return -1;
 }
+
+//returns true if current item is added to a form
+bool CComponentsItem::isAdded(CComponentsItem *parent_frm)
+{
+	if (cc_parent)
+		return true;
+
+	return false;
+}