[DefaultValue(null)]
public object SelectedObject { get; set; }

<DefaultValue(Nothing)>
Public Property SelectedObject As Object

using DevExpress.XtraVerticalGrid;
using DevExpress.XtraEditors.Repository;
// ...
PropertyGridControl pGrid = new PropertyGridControl();
this.Controls.Add(pGrid);
pGrid.SelectedObject = pGrid;
pGrid.Dock = DockStyle.Fill;
// Create a repository item which represents an in-place CheckEdit control.
RepositoryItemCheckEdit riCheckEdit = new RepositoryItemCheckEdit();
// Represent check boxes as radio buttons.
riCheckEdit.CheckStyle = DevExpress.XtraEditors.Controls.CheckStyles.Radio;
// Associate the Boolean data type with the created repository item.
pGrid.DefaultEditors.Add(typeof(Boolean), riCheckEdit);

Imports DevExpress.XtraVerticalGrid
Imports DevExpress.XtraEditors.Repository
' ...
Dim pGrid As PropertyGridControl = New PropertyGridControl()
Me.Controls.Add(pGrid)
pGrid.SelectedObject = pGrid
pGrid.Dock = DockStyle.Fill
' Create a repository item which represents an in-place CheckEdit control.
Dim riCheckEdit As RepositoryItemCheckEdit = New RepositoryItemCheckEdit()
' Represent check boxes as radio buttons.
riCheckEdit.CheckStyle = DevExpress.XtraEditors.Controls.CheckStyles.Radio
' Associate the Boolean data type with the created repository item.
pGrid.DefaultEditors.Add(GetType(Boolean), riCheckEdit)

propertyGridControl1.SelectedObject = null;
propertyGridControl1.Rows.Clear();

void UpdatePropertyGrid() {
    propertyGridControl1.SelectedObject = listBoxControl1.SelectedItem;
    propertyGridControl1.GetRowByFieldName("MeasureId").Properties.RowEdit = measureEdit;

InitializeComponent();
this.propertyGridControl1.SelectedObject = this.propertyGridControl1;
this.propertyGridControl1.GetRowByFieldName("Size").Expanded = true;

InitializeComponent();
    this.propertyGridControl1.SelectedObject = new CustomClass() { Property1 = "one", Property2 = "two", Property3 = "three", Property4 = "four", Property5 = "five" };
}

Data.File file = new Data.File() { Path = "C:\\Home", Path2 = "C:\\Public" };
    this.propertyGridControl1.SelectedObject = file;
}

SetCulture(cultureName)
propertyGridControl1.SelectedObject = Nothing
propertyGridControl1.Rows.Clear()

InitializeComponent()
propertyGridControl1.SelectedObject = propertyGridControl1
propertyGridControl1.GetRowByFieldName("Size").Expanded = True

InitializeComponent()
    propertyGridControl1.SelectedObject = New CustomClass() With {.Property1 = "one", .Property2 = "two", .Property3 = "three", .Property4 = "four", .Property5 = "five"}
End Sub

Dim file As Data.File = New Data.File() With {.Path = "C:\Home", .Path2 = "C:\Public"}
    propertyGridControl1.SelectedObject = file
End Sub

Private Sub _PropertyGrid_CustomPropertyDescriptors(ByVal sender As Object, ByVal e As CustomPropertyDescriptorsEventArgs)
    If TryCast(sender, PropertyGridControl).SelectedObject Is e.Source Then
        Dim properties As PropertyDescriptorCollection = e.Properties