'宣言 Public Property NodeImageExpanded As System.Drawing.Image
public System.Drawing.Image NodeImageExpanded {get; set;}
'宣言 Public Property NodeImageExpanded As System.Drawing.Image
public System.Drawing.Image NodeImageExpanded {get; set;}
Setting this property to null resets it and causes the grid to use the default image (a minus sign).
To hide the images, use the Style property.