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(sender as Grid)); //bind to children MenuItemData collection lbxSubMenuItemsSource = midTopChildren; //show submenu SubMenuIsOpen = true; } } //leaving submenu - close it void lbxSubMenu_MouseLeave(object sender, MouseEventArgs e) { SubMenuIsOpen = false; } } } In the constructor, you populate the data structures needed to create and initialize two Popups: TopMenu for the top-level menu, and SubMenu for a cascading submenu ListBoxes lbxTopMenu and lbxSubMenu are used to provide the content inside the Popups, with a style named styleMenu customizing them to look like a menu The data for the menus is stored as MenuItemData instances in the TopMenuData collection, with the Children property of the MenuItemData captioned My Network filled with items for a submenu The top menu is displayed in the click handler btnDropDown_Click() of the menu drop-down button.

You first call SetTopMenuPosition() to position the Popup, and then toggle its IsOpen property so that the menu either displays or is removed if it is already on display The cascading submenu is displayed in the MouseEnter handler LbxItemRoot_MouseEnter() of an item in the top-level menu You check to see if the top-level menu item has children, and if it does, you invoke SetSubMenuPosition() to position the submenu, set its data source Children collection, and toggle its display In the MouseLeave event handler of the ListBox lbxSubMenu representing the submenu, you turn off the submenu Let s look at the SetTopMenuPosition() and SetSubMenuPosition() methods used to position the Popups In both methods, the second parameter named CoordSpaceSource represents the source element whose coordinate space you need to transform from In Listing 5-6, in the case of SetTopMenuPosition(), this parameter is LayoutRoot, which is the Grid containing the menu drop-down button.

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The top menu Popup is then positioned along the Grid s bottom-left corner In SetSubMenuPosition(), you again use LayoutRoot But SetSubMenuPosition() accepts two additional parameters The third parameter, named ItemIndex, represents the index of the selected item in lbxTopMenu, and the fourth parameter, named ParentMenuItem, is the containing Grid for the ListBoxItem on the top menu that has been just selected To align the submenu pop-up with the topright corner of the ListBoxItem, you acquire the coordinate space transform as before But then you transform the point using ParentMenuItemActualWidth as the x parameter to the Point instance, and the total height of all menu items up to but not including the one identified by ItemIndex as the y parameter.

This causes the submenu to be positioned along the right edge of the top menu, with its top edge horizontally aligned with the parent menu item currently selected in the top menu Listing 5-7 shows the XAML for the page..

In the pet information form, let s suppose that the Pet s name field only accepts English letters, so constraint="/.[a-zA-Z]+/" is added as a property of the textbox of petName as follows:

Although you make some additions to the generated code that is highlighted in this recipe, there are no code files other than the default code generated by the Silverlight Business Application project template. We cover the generated code in detail for this recipe as a baseline for the recipes in the rest of this chapter. Also, because the Silverlight Business Application template is based on the Silverlight Navigation Application Project, which is covered in Recipe 6-10, we do not go into detail about the page navigation and other functionality brought in by that application template. The Silverlight Business Application template defines the WCF RIA Link between the Silverlight application and the web application. When the WCF RIA Link is established, any domain services created in the TestWeb web application are made available within the Silverlight project via the codegeneration functionality built into the WCF RIA Services framework. Figure 9-15 shows the Solution Explorer tool window for Recipe 9-5, with the Silverlight application on the left and the Recipe 9.5.Web project on the right.

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