Bug 178297 [Dialogs] - remove required field color
There are still some dialogs using the (now deprecated) class FieldAssistColors. We shouldn't color the required fields anymore in these dialogs: NewFolderDialog CreateLinkedResourceGroup ResourceWorkingSetPage ContainerSelectionGroup ResourceAndContainerGroup
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CreateLinkedResourceGroup.java
int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics,
				IDialogConstants.BUTTON_WIDTH);
		data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT,
				SWT.DEFAULT, true).x);
		button.setLayoutData(data);
		return data;
	}
	/**
	 * Sets the value of the link target field
	 * 
	 * @param target
	 *            the value of the link target field
	 */
	public void setLinkTarget(String target) {
		linkTarget = target;
		if (linkTargetField != null && linkTargetField.isDisposed() == false) {
			linkTargetField.setText(target);
		}
	}
	/**
	 * Validates the type of the given file against the link type specified in
	 * the constructor.
	 * 
	 * @param linkTargetFile
	 *            file to validate
	 * @return IStatus indicating the validation result. IStatus.OK if the given
	 *         file is valid.
	 */
	private IStatus validateFileType(IFileInfo linkTargetFile) {
		if (type == IResource.FILE && linkTargetFile.isDirectory()) {