Bug 149617 Support Content-type-based editor lookup
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/ReportPlugin.java
* @return String The string of comment preference
	 */
	public String getCommentPreference( )
	{
		return getPreferenceStore( ).getString( COMMENT_PREFERENCE );
	}
	/**
	 * set comment preference
	 * 
	 */
	public void setCommentPreference( String preference )
	{
		getPreferenceStore( ).setValue( COMMENT_PREFERENCE, preference );
	}
	/**
	 * set enable default comment preference
	 * 
	 */
	public void setDefaultEnableCommentPreference( )
	{
		getPreferenceStore( ).setDefault( ENABLE_COMMENT_PREFERENCE, true );
	}
	/**
	 * Return default enable comment preference
	 * 
	 * @return boolean The bool value of default enable comment preference
	 */
	public boolean getDefaultEnabelCommentPreference( )
	{
		return getPreferenceStore( ).getDefaultBoolean( ENABLE_COMMENT_PREFERENCE );