CTREECTRLFX: CLASSE GÉRANT AUTOMATIQUEMENT UN CHECKBOX À TROIS ÉTATS DANS LE TRI CONTROL

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//	        --- HOW TO USE THIS CLASS ---
// This is a class derived of CTreeCtrl which able you to use a 3 state 
// checkbox in your CTreeCtrl.
// You must create a bitmap 56(wide)*11pixels(height) which must contains
// four small icons (11*11) separated each other of 3 pixels
// Example: Icon1-3pixels-Icon2-3pixels-Icon3-3pixels-Icon4-3pixels
// The ID of the bitmap must be IDB_BITMAP_TREE and can have 256 colors
// The first Icon must represent NOSTATE state. The second Icon, UNCHECKED state.
// The third Icon, CHECKED state and the last, CHILD_CHECKED.
// You must use the SetCheckItemFX and GetCheckItemFX's methods for using
// correctly this class.
// The others methods work but they are specials utilities.
// After doing an instance of this class you MUST launch 
// the InitTreeCtrlFX's method!!!
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