Bug 155273 [Markers] Visibility of problems view columns should be configurable
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
* @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
			 */
			public boolean hasChildren(Object element) {
				return ((MarkerSupportItem) element).getChildren().length > 0;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
			 *      java.lang.Object, java.lang.Object)
			 */
			public void inputChanged(Viewer viewer, Object oldInput,
					Object newInput) {
			}
		};
	}
	/**
	 * Get the id of the marker field in treeColumn.
	 * 
	 * @param treeColumn
	 * @return String
	 */
	private String getFieldId(TreeColumn treeColumn) {
		return ((MarkerField) treeColumn.getData(MARKER_FIELD))
				.getConfigurationElement().getAttribute(
						MarkerSupportInternalUtilities.ATTRIBUTE_ID);
	}
	/**
	 * Return the ids of the generators specified for the receiver.
	 *