https://wiki.selfhtml.org/extensions/Selfhtml/example.php/Beispiel:JS-Event-onmousedown.html
Beispiel: mousedown Event
mousedown eventbeispiel
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.control.mousedown?view=netframework-4.8.1&tree=cete.dynamicpdf.viewer.pdfnavigationpanel.mousedown
Control.MouseDown Event (System.Windows.Forms) | Microsoft Learn
Occurs when the mouse pointer is over the control and a mouse button is pressed.
mousedown eventwindows formsmicrosoft learncontrolsystem