How did you manage to set the Bounds property ??? it keeps giving me an error when I try to change the Bounds width and height and keep saying that it is not a variable, so I wonder how you managed to do that !!! Can you post the line of code you used please ???
Simply set the Size to the same size as the tabcontrols by
tabControl_Resize(object sender, EventArgs e)
listBox.Size = tabControl.Size;