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For the other buttons, convert the active child form, if any, to a MainForm instance. If the active child is a MainForm object, then click the menu item corresponding to the selected button.

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This code invokes the menus in the ParentForm class for the New and Open buttons, and the appropriate menu in the active MainForm object, if any, otherwise. Note the use of the internal keyword for the new methods in the MainForm class. This permits these members to be accessed from within the MyPhotos.exe assembly only, in this case from the ParentForm class. Compile and run the code to verify that your toolbar works property. Make sure the buttons perform as expected when no child window is present, and when the active child does and does not contain any photographs in its album.

TRY IT!

core topics that you found in step 3, read the detailed breakdown of each core topic These are the particular subjects that the IGDA Education Committee suggests would be relevant: the ones that would be most useful for you to study for that career Go through and highlight the ones from your list If you re interested in more than one career, use different colored highlighters for each one (but note that some will overlap!) Remember, the Framework is not a curriculum or a course of study, it is simply a list of useful topics Don t assume you must study everything in it, or even everything it recommends for a given career

Add a new button to the parent form similar to the tbbImages button in our MainForm toolbar. This will require a DropDownButton style of toolbar button, and a new internal method in MainForm to assign the display mode for the form.

DISPLAYING PIXEL DATA The PixelDlg form is another area where the behavior in our MDI application is not quite as desired. Right now each child has a separate pixel dialog, and these dialogs are separate from the parent form. To integrate this feature with our MDI application, it would be nice if a single PixelDlg was used for all album windows, and if this dialog was an MDI child form as well. We would also like to preserve our ability to run the MyPhotos application as an SDI where only a single album is displayed at a time. This section will make the changes in our code required by these features, the result of which appears in figure 16.7. These changes will involve the following tasks: Create a global PixelDlg instance that can be shared by all MainForm instances. Provide a means to display this dialog as an MDI child form. Access this global instance from the MainForm class instances. Ensure this dialog is always associated with any active MainForm window.

Figure 16.7 The PixelDlg form in this figure is partially obscured to prove that it really is a child form in our MDI application, rather than the modeless dialog originally created in chapter 8.