RadSpinEditor now supports null values. This functionality is relevant for the PropertyGridSpinEditor as well http://docs.telerik.com/devtools/winforms/editors/spineditor/null-value-support
How to use it: private void RadPropertyGrid1_EditorInitialized(object sender, PropertyGridItemEditorInitializedEventArgs e) { PropertyGridSpinEditor editor = e.Editor as PropertyGridSpinEditor; if (editor!=null) { BaseSpinEditorElement el = editor.EditorElement as BaseSpinEditorElement; el.EnableNullValueInput = true; } } When the editor is activated, pressing Ctrl+Del will clear the value.