property Button.ToolTipText as String
Specifies the control's tooltip text.

TypeDescription
String A string expression that defines the button's tooltip.
Use the ToolTipText and ToolTipTitle properties to define the button's tooltip. Use the ToolTipDelay and ToolTipPopDelay properties to specify the time in ms that passes before the ToolTip appears. Use the <img> HTML tag to insert icons inside the button's tooltip.

The ToolTipText supports the following HTML tags: 

In the VB environment, the extended wrapper control that implements properties like Visible, Top, Left, Width, Height ... and so on includes also a property named TooltipText that can provide confusions. In order to avoid confusions on this name, the VB users must call at runtime a code like:

With Button1
    .Object.ToolTipText = "In VB, this is the right way to call the ToolTipText property at runtime."
End With

If the Object property is missing, the code changes the TooltipText property of the VB extended class, instead calling object's property.