Button1.As(JavaObject).RunMethod("setId",Array("Button1"))
MainForm.Stylesheets.Add(File.GetUri(File.DirAssets, "mycss.css"))
' css file mycss.css
#Button1:hover{
-fx-background-color: red;
-fx-background-insets: 0 0 -1 0, 0, 1, 2;
-fx-background-radius: 3px, 3px, 2px, 1px;
-fx-padding: 0.333333em 0.666667em 0.333333em 0.666667em; /* 4 8 4 8 */
-fx-text-fill: -fx-text-base-color;
-fx-alignment: CENTER;
-fx-content-display: LEFT;
}