UI: Messagebox when button is clicked

Hello all

I've created a VERY simple form with a button on it. This is the code:

'Create the form:

frmVareAddOn = SBO_Application.Forms.Add("VareAddOnForm")

frmVareAddOn.Height = 599

frmVareAddOn.Left = 275

frmVareAddOn.Title = "My button-form"

frmVareAddOn.Top = 48

frmVareAddOn.Width = 473

'Create the button

oItem = frmVareAddOn.Items.Add("btnHello", SAPbouiCOM.BoFormItemTypes.it_BUTTON)

oItem.Height = 19

oItem.Left = 365

oItem.Top = 28

oItem.Width = 65

oButton = oItem.Specific

oButton.Caption = "Hello"

When I run the project, the form with the button is shown - but how can I show a MessageBox when the button is clicked?