Make CheckBoxEditingSupport applicable for TreeViewers.

TODO: Rename package (see #3176)
refs 3176

org.fortiss.tooling.base.ui/trunk/src/org/fortiss/tooling/base/ui/tablecell/CheckBoxEditingSupport.java

@@ -21,7 +21,6 @@ import org.eclipse.jface.viewers.CellEditor;
 import org.eclipse.jface.viewers.CheckboxCellEditor;
 import org.eclipse.jface.viewers.ColumnViewer;
 import org.eclipse.jface.viewers.EditingSupport;
-import org.eclipse.jface.viewers.TableViewer;
 
 /**
  * {@link EditingSupport} for checkbox cells.
@@ -29,19 +28,17 @@ import org.eclipse.jface.viewers.TableViewer;
  * @author hoelzl
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating GREEN Hash: 0E48EDEDD7575A54341D6BE6926F0792
+ * @ConQAT.Rating YELLOW Hash: 2EC9E3CC10AF755346867DAECA167352
  */
 public abstract class CheckBoxEditingSupport extends EditingSupport {
 
-	/**
-	 * Stores the shared cell editor.
-	 */
+	/** Stores the shared cell editor. */
 	private CellEditor cellEditor;
 
 	/** Constructor */
 	public CheckBoxEditingSupport(ColumnViewer viewer) {
 		super(viewer);
-		cellEditor = new CheckboxCellEditor(((TableViewer)viewer).getTable());
+		cellEditor = new CheckboxCellEditor(viewer.getControl().getParent());
 	}
 
 	/** {@inheritDoc} */