Bug 122365 In data set dialog, add parameter first then edit query, parameter value will be cleared out.
Description: In data set dialog, add parameter first then edit query, parameter value will be cleared out. Steps to reproduce: 1. Add a data set. 2. In data set dialog, add a parameter. 3. Edit query and use this parameter. 4. Preview in data set dialog, it works. 5. Change to "parameter" page, its value is cleared out.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/PropertyHandleTableViewer.java
{
    private TableViewer viewer;
    private Composite mainControl;
    private Button btnRemove;
    private Button btnUp;
    private Button btnDown;
    private MenuItem itmRemove;
    private MenuItem itmRemoveAll;
    
    /**
     * 
     */
    public PropertyHandleTableViewer(Composite parent, boolean showMenus, boolean showButtons, boolean enableKeyStrokes)
    {
        mainControl = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        mainControl.setLayout(layout);
        GridData data = null;
        viewer = new TableViewer(mainControl, SWT.FULL_SELECTION);
        data = new GridData(GridData.FILL_BOTH);
        viewer.getControl().setLayoutData(data);
        
        viewer.getTable( ).setHeaderVisible( true );