Irregularities when adding controls to my panel. They show up whever they want!

Answer 1

I don't know how your class structure is, but that empty space looks to be about what the other controls make up. Perhaps somewhere a movie isn't being found, and thus isn't showing anything?

Answer 2

ok, the problem appears when the AutoScroll property of panel is set to true and the scroll bar is not at its initial position:0. The panel is positionning the controls at ypos + vertical position of scroll bar!!

Either set AutoScroll = false; before adding MovieItem then true; after, but this will reset the scroll bar position
or, substract the scroll bar position from ypos when setting the location.

Both fix the problem but the 2nd is better (no scroll bar reset):

public void X()
{
    int vscrollPos = panel1.VerticalScroll.Value;   

    MovieItem NewMovie = new MovieItem();
    NewMovie.SearchMovie(txtSearch.Text);
    NewMovie.Location = new Point(0, ypos - vscrollPos);
    ypos += 196;

    panel1.Controls.Add(NewMovie);
}