MFC Ribbon edit control needs double click to activate - c++

Question

I created a simple MFC ribbon app using the App Wizard. Then, I removed all the controls in the ribbon and added a simple button, and two edit boxes, and added event handlers for each.
The event handler for the button is a simple message loop as followed :
void CRibbon2Doc::OnButton(){
MSG msg;
while (1){
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
And the message handlers for the two Edit Boxes are also simple as followed:
void CRibbon2Doc::OnEdit1(){
OutputDebugString(_T("Box1"));
}
void CRibbon2Doc::OnEdit2(){
OutputDebugString(_T("Box2"));
}
Here is my problem :
Case : Button not clicked, i.e. my message loop not running
In this case, when I click on an Edit Box, I immediately see the blinking cursor that lets me write inside the Edit box. No problem here.
Case : Button clicked, i.e. my message loop is running
In this case, when I click an Edit Box, I do not see a blinking cursor that will let me write inside the edit box. I need to double click for the blinking cursor to show up. This is a problem, I would like to avoid making the users double click inside a box just to activate it.
Can you please tell me what could be the reason, and how to make it such that I can obtain a blinking cursor inside the edit boxes on a single click in the case where my message loop is running in the background.
I am basically struggling with a real life problem, and this is a simplified version of the problem, and a lot is on the line, please help.