Improvement description related to the Text property

The Text property is of no use. Inheriting from UserControl instead of Control would fix this, i.e. hide it. Alternatively:

[Bindable(false)]
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Never)]
public override string Text { get; set; }

Improvement description related to the *Cursor properties

The [OxyPlotCategory] properties *Cursor should have the [Description] and [DefaultValue] attributes. The first for the obvious reason, the latter for proper behaviour in the Visual Studio designer, e.g. no code generated in the form's .Designer.cs for properties still using default values.