Bug 5571 JAR Packager: Reveal first checked project
If the list of projects in the JAR Packager is long it is possible that the shown projects are not checked even though there are checked projects (due to current selection). ==> reveal the first checked project.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
}
		if (targetFile.exists()) {
			if (!targetFile.canWrite()) {
				setErrorMessage(JarPackagerMessages.getString("JarPackageWizardPage.error.jarFileExistsAndNotWritable")); 
				fDestinationNamesCombo.setFocus();
				return false;
			}
		}
		return true;
	}
	/*
	 * Overrides method from WizardExportPage
	 */
	protected void createDestinationGroup(Composite parent) {
		
		initializeDialogUnits(parent);
		
		
		Composite destinationSelectionGroup= new Composite(parent, SWT.NONE);
		GridLayout layout= new GridLayout();
		layout.numColumns= 3;
		destinationSelectionGroup.setLayout(layout);
		destinationSelectionGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
		new Label(destinationSelectionGroup, SWT.NONE).setText(getDestinationLabel());
		
		fDestinationNamesCombo= new Combo(destinationSelectionGroup, SWT.SINGLE | SWT.BORDER);
		fDestinationNamesCombo.addListener(SWT.Modify, this);
		fDestinationNamesCombo.addListener(SWT.Selection, this);
		GridData data= new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
		data.widthHint= SIZING_TEXT_FIELD_WIDTH;