Bug 297731 [Filters] We could have IResourceFilterDescription#delete instead of IContainer#removeFilter ?
This is the pattern used for resource markers. It is just a minor issue, however would make new API look more consistent.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceFilterGroup.java
Color color = argumentsLabel.getDisplay().getSystemColor(
				filter.hasStringArguments() ? SWT.COLOR_BLACK : SWT.COLOR_GRAY);
		argumentsLabel.setForeground(color);
	}
	/**
	 * @param font
	 * @param composite
	 */
	private void createDescriptionArea(Font font, Composite composite) {
		GridData data;
		description = new Label(composite, SWT.LEFT | SWT.WRAP);
		description.setText(FilterTypeUtil.getDescriptor(filter.getId())
				.getDescription());
		data = new GridData(SWT.FILL, SWT.BEGINNING, true, true);
		data.widthHint = 300;
		data.heightHint = 40;
		description.setLayoutData(data);
		description.setFont(font);
	}
	/**
	 * @param font
	 * @param composite
	 */
	private void createIdArea(Font font, Composite composite) {
		GridData data;
		Group idComposite = createGroup(font, composite, NLS.bind(
				IDEWorkbenchMessages.ResourceFilterPage_columnFilterID, null),
				true);
		idCombo = new Combo(idComposite, SWT.READ_ONLY);
		idCombo.setItems(FilterTypeUtil.getFilterNames(filter