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I add a button in your sample app.
and select the top-left button in the combo-box.

How do I update the treeview in the program?
Part sample is like this. And, it only update button1’s text color.

void CMainDlg::OnBnClickedButton1()
{
static    COLORREF rgbs[3] = {RGB(255,0,0), RGB(0,255,0), RGB(0,0,255) };
static int idx = 0;
    m_Btn1.TextColorSet(rgbs[idx]);
...
    // update propertygrid control here!!!
...
    idx = ( idx + 1 ) % 3;
}

The CExtPropertyGridCtrl::PropertyStoreSynchronize() method updates the entire content of a property grid control and you should invoke this method only one time after several property values were changed.

It is not completely clear what you mean by "update the treeview". If you want to change the value of a property grid’s cell, you should have a pointer to the cell object.

Sorry, I mean refresh.
In the code, I modify the text color. But, This time, the old color value is in the property grid.