How to set fixed window size for Universal Windows Application

Question

I just started to develop an Universal Windows Application in VS2015 Community Edition. I have used the sample called PieCharts for Windows UWP.

My problem is that

Answer 1

I guess the only choice is use OnSizeChanged Method to control size of window. It's work's for me. Maybe not the best choice but really easy way to solve problem.

private void FormName_SizeChanged(object sender, SizeChangedEventArgs e)
{
    if((this.Width != 400) & (this.Height != 650))
    {
        this.Width = 450;
        this.Height = 650;
    }
}