Steema Central

Use the Tools collection editor to add an annotation tool and
edit its name and then click 'ok'. -> it crashes with a System.NullReferenceException.

For example:
Add an annotation via the 'Edit' from the right click menu. Then
upon Initializing your form you set:

annotation.Active = false
In a button or some other UI element at a handler that sets:
annotation.Active = false
annotation.Shape.Transparency = 80;

Lauch application then click the button -> crash with null reference exception

For the latter one is there a work-around?
I'd like the annotation to be invisible at first and then
make it visible and set the transparency as shown above.

annotation1.Shape.Brush.Transparency = 80;

to reproduce the exception for annotation name property change:

1. In design mode click on the tchart and then loock at its
properties in the .NET solution explorer (click the properties tab)
2. Click on the 'Tool' property which will bring up the collection editor for all
the tools in the chart
3. Add an annotation and look at the 'Name' property shown in
that collection editor.
4. Change the name property (it is editable as is should be) and click the 'OK'
button
5 Exception happens and your form/dialog will reflect that clearly.

Thanks for the hint with the annotation.Shape.Brush.Transparency workaround. It works.