Resizing grid layout doesn't work in maximized WindowState

I have created an App using the "2-panel App with Auto-Reflow" template and I want to change the width of the 2 panels. Here's the relevant code:

function startupFcn(app)
    fig_position = app.UIFigure.Position;
    fig_width = fig_position(3);
    fig_height = fig_position(4);
    app.GridLayout.ColumnWidth = {0.54*fig_width, 0.46*fig_width};
    app.GridLayout.RowHeight = fig_height;
end

I have also set the WindowState property of the UIFigure element to 'maximized'. However, the panels don't have the correct width. What am I missing?

Answer 1

[John F]

Add "drawnow" at the beginning of the function like this:

function startupFcn(app)
    drawnow
    fig_position = app.UIFigure.Position;
    fig_width = fig_position(3);
    fig_height = fig_position(4);
    app.GridLayout.ColumnWidth = {0.54*fig_width, 0.46*fig_width};
    app.GridLayout.RowHeight = fig_height;
end