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In this example, you want these three RadioButton controls to be mutually exclusive. In other GUI frameworks, ensuring that a group of related controls (such as radio buttons) were mutually exclusive required that you place them in the same group box. You don t need to do this under WPF. Instead, you can simply assign them all to the same group name. This is helpful because the related items do not need to be physically collected in the same area, but can be anywhere in the window. Do this by selecting each RadioButton on the designer (you can select all three using a Shift-Click operation), and then setting the GroupName property (located in the Common Properties area of the Properties window) to InkMode. When a RadioButton control is not placed inside of a parent panel control, it will take on a UI identical to a Button control! However, unlike a Button, the RadioButton class includes an IsChecked property, which toggles between true and false when the end user clicks the UI element. Furthermore, RadioButton provides two events (Checked and Unchecked) that you can use to intercept this state change. To configure your RadioButton controls to look like typical radio buttons, select each control on the designer using a Shift+Click operation, then right-click the selection and pick the Group Into Border menu option (see Figure 28-34).

To take a look at a more ambitious pie-chart/bar-chart renderer, you can download a free starter kit sample from Microsoft s ASP.NET website at http://www.asp.net/ReportsStarterKit. This sample is available in C# and VB .NET and is free to customize as you desire. Although it sports improved drawing logic, the mechanism used to transfer information is somewhat limited. Because it uses the query string, there s a limit to how much chart data you can specify. Of course, nothing is stopping you from improving the example to support other options, such as session state.

Figure 28-34. Grouping items in a Border control At this point, you re ready to test the program, which you can do by pressing the F5 key. You should now see three mutually exclusive radio buttons and a combo box with three selections (see Figure 2835).

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Figure 28-35. The completed toolbar system Before you finish the UI of your Ink API tab, you need to handle the Click event for each RadioButton control. Similar to Visual Studio, the Blend Properties window has a Lightning Bolt button to enter the names of event handlers (you can see it mounted next to the Name property). Use this tool to route the Click event for each button to the same handler, named RadioButtonClicked (see Figure 28-36).

Summary

Figure 28-36. Handling the Click event for each RadioButton Doing this brings up the Blend code editor. Once you handle all three Click events, handle the SelectionChanged event of the ComboBox using a handler named ColorChanged. When you finish, you should have the following C# code: public partial class MainWindow : Window { public MainWindow() { this.InitializeComponent(); // Insert code required on object creation below this point. }

In this chapter, you learned how to master basic and advanced GDI+. Although these techniques aren t right for every web page, they give you a set of features that can t be matched by many other web application programming frameworks. You also explored how to create server-side image maps with the ImageMap control. For even more detailed information about how GDI+ works and how to optimize it, you may be interested to check out Pro .NET 2.0 Graphics Programming (Apress, 2005).

height="100%" horizontalAlign="center" verticalAlign="middle" paddingLeft="10" paddingRight="10" paddingBottom="10" paddingTop="10"> <mx:Box id="boxLightBlue" borderColor="#05DBEE" borderStyle="solid" borderThickness="5" width="100%" height="50%"> </mx:Box> <mx:Box id="boxGreen" borderColor="#05EEA4" borderStyle="solid" borderThickness="5" width="100%" height="50%"> </mx:Box> </mx:VBox> </mx:HBox> </mx:Application> As you can see from the preceding code, the MXML class is shorter than the AS one. It is more familiar for people coming from HTML or other meta tag languages such as ColdFusion and JSP. However, I want to remind you to use MXML just for layout or view purposes, and to use AS for the logic of your application.

private void RadioButtonClicked(object sender, System.Windows.RoutedEventArgs e) { // TODO: Add event handler implementation here. } private void ColorChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e) { // TODO: Add event handler implementation here. } } You will implement these handlers in a later step, so leave them empty for the time being.

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