net9.0-windows10.0.22621 
namespace System.Windows.Forms
{
    [DefaultEvent("ButtonClick")]
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)]
    public class ToolStripSplitButton : ToolStripDropDownItem
    {
        [Browsable(false)]
        public bool ButtonSelected { get; }
    }
}
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.NET 5.06.07.08.09.0
.NET Core 3.03.1
.NET Framework 2.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net9.0
Platforms This API is only available when you target a specific platform:
Windows 7.08.010.0.1776310.0.1836210.0.1904110.0.2034810.0.2200010.0.22621
Information specific to net9.0-windows10.0.22621
Assembly

System.Windows.Forms , Version=9.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs to set <UseWindowsForms>True</UseWindowsForms>.

Platform Restrictions

The property getter is only supported on the following platforms:

  • Windows >= 6.1
  • Built-in API
  • Package-provided API