Bug 122412 Need a scroll bar to display the full description in expression builder
Description: Need a scroll bar to display the full description in expression builder Step to reproduce: 1.Open the expression builder, choose BIRT JS Object->Total Expected result: All the methods and description could be displayed.Since we can't resize the dialog of expression builder, a scroll bar is needed Actual result: The methods and description are truncated due to the limited space (see the sreenshot in attachment)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionBuilder.java
{
	private static final String DIALOG_TITLE = Messages
			.getString( "ExpressionBuidler.Dialog.Title" ); 
	private static final String PROMRT_MESSAGE = Messages
			.getString( "ExpressionBuilder.Message.Prompt" ); 
	private static final String LABEL_FUNCTIONS = Messages
			.getString( "ExpressionBuilder.Label.Functions" ); 
	private static final String LABEL_SUB_CATEGORY = Messages
			.getString( "ExpressionBuilder.Label.SubCategory" ); 
	private static final String LABEL_CATEGORY = Messages
			.getString( "ExpressionBuilder.Label.Category" ); 
	private static final String LABEL_OPERATORS = Messages
			.getString( "ExpressionBuilder.Label.Operators" ); 
	private static final String TOOL_TIP_TEXT_REDO = Messages
			.getString( "TextEditDialog.toolTipText.redo" ); 
	private static final String TOOL_TIP_TEXT_UNDO = Messages
			.getString( "TextEditDialog.toolTipText.undo" ); 
	private static final String TOOL_TIP_TEXT_DELETE = Messages
			.getString( "TextEditDialog.toolTipText.delete" ); 
	private static final String TOOL_TIP_TEXT_PASTE = Messages
			.getString( "TextEditDialog.toolTipText.paste" ); 
	private static final String TOOL_TIP_TEXT_CUT = Messages
			.getString( "TextEditDialog.toolTipText.cut" ); 
	private static final String TOOL_TIP_TEXT_COPY = Messages
			.getString( "TextEditDialog.toolTipText.copy" ); 
	private class TableContentProvider implements IStructuredContentProvider
	{