AppBar focus issue [modified]
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I have created an AppBar. The AppBar always stays on top, when it loses focus, then to get back to the AppBar requires two clicks instead of one. I believe the first click activates the form and then with second click I receive the mouse click events (as expected). Can you give any ideas, what can be wrong here? My problem is similar to this one Appbar and focus issues[^]. Unfortunately the OP in that link hasn't posted his solution :(. I created the AppBar following this article from CodeProject C# does Shell, Part 3[^] I looked into it with Spy++ but don't have any idea why this is happening. Here is the Spy++ log which I obtained testing out this scenario (first click doesn't works, second does).
<00001> 00090CFE S WM_PARENTNOTIFY fwEvent:WM_LBUTTONDOWN xPos:25 yPos:17
<00002> 00090CFE R WM_PARENTNOTIFY
<00003> 00090CFE S WM_WINDOWPOSCHANGING lpwp:0418EAE4
<00004> 00090CFE R WM_WINDOWPOSCHANGING
<00005> 00090CFE S WM_ACTIVATEAPP fActive:True dwThreadID:00000000
<00006> 00090CFE R WM_ACTIVATEAPP
<00007> 00090CFE S WM_NCACTIVATE fActive:True
<00008> 00090CFE R WM_NCACTIVATE
<00009> 00090CFE S WM_ACTIVATE fActive:WA_CLICKACTIVE fMinimized:False hwndPrevious:(null)
<00010> 00090CFE S WM_IME_SETCONTEXT fSet:1 iShow:C000000F
<00011> 00090CFE S WM_IME_NOTIFY dwCommand:IMN_OPENSTATUSWINDOW dwCommand:00000002 dwData:00000000
<00012> 00090CFE R WM_IME_NOTIFY
<00013> 00090CFE R WM_IME_SETCONTEXT
<00014> 00090CFE S WM_SETFOCUS hwndLoseFocus:(null)
<00015> 00090CFE R WM_SETFOCUS
<00016> 00090CFE R WM_ACTIVATENow happens the second click (which works)
<00017> 00090CFE S WM_PARENTNOTIFY fwEvent:WM_LBUTTONDOWN xPos:25 yPos:17
<00018> 00090CFE R WM_PARENTNOTIFY
<00019> 00090CFE S WM_WINDOWPOSCHANGING lpwp:0418E40C
<00020> 00090CFE R WM_WINDOWPOSCHANGINGLooking at the Spy++ logs, I believe the problem is with activation, I think that it only receives WM_LBUTTONDOWN event if the window is activated. But how come other windows aren't activated but they still work with one click (i.e. I don't have to click it first). **EDIT:**I think the problem