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When you wish to populate the UI of a Form-derived type, you typically follow a predictable series of steps: Define a member variable of a given UI element within the Form-derived class. Configure the look and feel of the UI element. Add the UI element to the form s ControlsCollection container using a call to Controls.Add().

Figure 35-10. Dynamically hiding and showing panels To create this example, you need to start by adding the hyperlinks. The URL is unimportant, because you ll be handling the click event on the client. However, if you leave it blank, you ll need to manually add the formatting you want. (Typically, links display in blue, underlined lettering.) A quicker option is to supply # for the URL, which creates a link that points to the current page: <a href="#" id="lnkHide">Hide the Name Box</a>   <a href="#" id="lnkShow">Show the Name Box</a> Now, you need to add these two hyperlinks and the <div> that represents the box of controls to your Atlas script. Here s the complete markup: <label id="pnlNames" /> <hyperLink id="lnkHide"> <click> <setProperty target="pnlNames" property="visibilityMode" value="Collapse" /> <setProperty target="pnlNames" property="visible" value="false" /> </click> </hyperLink> <hyperLink id="lnkShow"> <click> <setProperty target="pnlNames" property="visible" value="true" /> </click> </hyperLink> You ll notice that the lnkHide hyperlink actually performs two actions first it makes sure the visibilityMode property is set correctly, and then it hides the panel. All controls support two visibility modes: Collapse (which removes the content from the page entirely) and Hide (which replaces the content with blank space). If you want the rest of the page to reflow to fill the space that s vacated by the hidden control, you must use the Collapse mode.

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Assume you wish to update your MainWindow class to support a File Exit menu system Here are the relevant updates, with code analysis to follow: class MainWindow : Form { // Members for a simple menu system private MenuStrip mnuMainMenu = new MenuStrip(); private ToolStripMenuItem mnuFile = new ToolStripMenuItem(); private ToolStripMenuItem mnuFileExit = new ToolStripMenuItem(); public MainWindow(string title, int height, int width) { .. // Method to create the menu system BuildMenuSystem(); } private void BuildMenuSystem() { // Add the File menu item to the main menu mnuFileText = "&File"; mnuMainMenuItemsAdd(mnuFile); // Now add the Exit menu to the File menu mnuFileExitText = "E&xit"; mnuFileDropDownItemsAdd(mnuFileExit); mnuFileExitClick += (o, s) => ApplicationExit(); // Finally, set the menu for this Form ControlsAdd(thismnuMainMenu); MainMenuStrip = thismnuMainMenu; } } Notice that the MainWindow type now maintains three new member variables.

The MenuStrip type represents the entirety of the menu system, while a given ToolStripMenuItem represents any topmost menu item (eg, File) or submenu item (eg, Exit) supported by the host You configure the menu system within the BuildMenuSystem() helper function Notice that the text of each ToolStripMenuItem is controlled through the Text property; each menu item has been assigned a string literal that contains an embedded ampersand symbol As you might already know, this syntax sets the Alt key shortcut Thus, selecting Alt+F activates the File menu, while selecting Alt+X activates the Exit menu Also notice that the File ToolStripMenuItem object (mnuFile) adds subitems using the DropDownItems property The MenuStrip object itself adds a topmost menu item using the Items property Once you establish the menu system, you can add it to the controls collection (through the Controls property).

To extend this example, you can add more collapsible controls. You can then allow the user to hide and show each panel individually or choose one panel at a time. The result is similar to what you can achieve with the Panel and MultiView server controls, except Atlas allows all the collapsing to take place without a server postback.

Next, you assign your MenuStrip object to the form s MainMenuStrip property This step might seem redundant, but having a specific property such as MainMenuStrip makes it possible to dynamically establish which menu system to show a user You might change the menu displayed based on user preferences or security settings The only other point of interest is the fact that you handle the Click event of the File Exit menu; this helps you capture when the user selects this submenu The Click event works in conjunction with a standard delegate type named SystemEventHandler This event can only call methods that take a.

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