dependency property registered in generic base class

Question

I am trying to construct a validating textbox control using a generic abstract base class as follows and register Min and Max value properites:

public abstract class ValidatingTextBoxBase<T, C> 
    : TextBox where T : Icomparable<T>


public static readonly DependencyProperty MinValueProperty = 
    DependencyProperty.Register("MinValue", typeof(T), typeof(C), 
    new FrameworkPropertyMetadata(DefaultMinValue));

    public T MinValue
    {
        get { return (T)GetValue(MinValueProperty); }
        set { SetValue(MinValueProperty, value); }
    }

Then I declare several text box controls:

public class IntegerTextBox : ValidatingTextBoxBase<int, IntegerTextBox>
{

public class DecimalTextBox : ValidatingTextBoxBase<decimal, DecimalTextBox>
    {

At runtime this works great however I get a lot of design time errors for

'MinValue' property was already registered by 'DecimalTextBox'

or it will be IntegerTextBox or one of the others depending on which view is open.

Any thoughts/help would be appreciated.