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An MDI Interface using Tabs with Close Buttons

References

For interaction between TabControl MDI Child Forms:
Tabbed MDI Child Forms

For drawing close buttons on tabs:
IMPLEMENTING CLOSE BUTTON IN TAB PAGES

Changes from Reference Code:

In the original example from "Tabbed MDI Child Forms", MDI child forms had thier window flicker during tab selection. Most likely this was due to "FormWindowState.Maximized" being called in "Form1_MdiChildActivate". I took out that line of code and had all child forms derive an intermediary form class "_childForm". There they will inherit a load method where "FormWindowState.Maximized" is called and ControlBox (minimize, maximize and close).

I didn't want to add menu items (through the Visual Studio Designer) each time a new MDI child form was introduced. Now they are generated for each "_childForm"(that exist within the assembly) and for the interfaces represented in an implementation tree in "menuStripFormation.cs". As long as a "_childForm" implements an interface within said tree, It will have a menu item made. Click events for menu items (derived from "_childForm") are generated within MenuItemForChildForm.

For "IMPLEMENTING CLOSE BUTTON IN TAB PAGES", I replaced the 'x' that represented the close button with an image. To give it a button effect, I had the image redrawn from mouse events within the tabcontrol.