Object Model - Additional Methods and Functions - SetImageToolTip

Assigns the passed ImageTTDatasource-object to the extended property provided to a specific control.

[Visual Basic]
<ExtenderProvidedProperty()> _ 
Public Sub SetImageToolTip( _
		ByVal acontrol As Control, _ 
		ByVal ds As ImageTTDataSource)
public void SetImageToolTip(
	Control acontrol,
	ImageTTDataSource ds



The target-control. The passed ImageTTDatasource-object is attached to the extended property provided to this control by the tooltip-component.


The new ImageTTDatasource-object to attach to the extended property of acontrol.


This method assigns the passed ImageTTDatasource-object (ds) to the extended property provided to the specified control (acontrol) by the ImageToolTip-component (ToolTipsFactoryImage). It is this object which holds the tooltip-content (and some other properties) used for the tooltip to be displayed for acontrol.

In the Visual Studio property-grid the access to the ImageTTDatasource-object of a specific control is seamlessly integrated in the property-list of the specific control. (See the chapter on "Provided Properties" for more information.)

To assign a new or another instance of an ImageTTDatasource-object to the extended property of a specific control through code, things are not exactly as one would expect: The ImageTTDatasource-object is a property provided to a control by the tooltip component, and - if looking at the property-grid of the control - it definitely seems to be just a normal property of that control, but if you try to assign a new value to this property by code as to any other property of the control, you'll see that this is not possible, because the control does not expose such a property. Actually, the control, to which the tooltip-component provides this property, has absolutely no knowledge about this provided property, because this extended properties are managed by the providing component (in this case the ImageToolTip-component). Therefore the programmatic access to this properties has to happen through the providing component.  And that's where SetImageToolTip() comes into play. SetImageToolTip() tells the tooltip-component to set the passed ImageTTDatasource-object (ds) as new value for the property provided to the specified control (acontrol).

The following example shows how this could look in code:


'Create a new ImageTTDataSource

Dim myToolTipDS As ImageTTDataSource

myToolTipDS = New ImageTTDataSource


'We assign new content (an image retrieved from


myToolTipDS.Image = GetImage("ChangeCartridge")


'And - because we know that this image contains

'interesting details - we have to make sure that it is

'displayed with an appropriate size. For this,

'we override the DefaultWidth defined by the

'tooltip-component with an adequate value.

myToolTipDS.Override.DefaultWidth = 480


'Finally we can assign the new ImageTTDataSource-object

'to the extended property provided to lblChangeCartridge

Me.fotoTutorialTT.SetImageToolTip(Me.lblChangeCartridge, myToolTipDS)