.NET Framework Class Library писал(а):
MouseWheel Event - Occurs when the mouse wheel moves while the control has focus.
The Windows Forms controls in the following list are not selectable. Controls derived from these controls are also not selectable.
Panel
GroupBox
PictureBox
ProgressBar
Splitter
Label
LinkLabel (when there is no link present in the control)
PictureBox1.Focus()
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