Changes in designer reinitialized after building the solution

See more:

C#

VB

.NET

I have a class inherited from a control
I set some properties that i want in inherited class
i drag my custom control in the from then change some properties. but when i rebuild it, changes in designer is disappeared and again is like base control.
This is my code, i want to change the ValueType in designer to decimal.
Thanks.

public class NumericEditBoxBase : NumericEditBox
   {
       public NumericEditBoxBase()
       {
           InitializeComponent();
       }
       private void InitializeComponent()
       {
           this.SuspendLayout();
           this.VisualStyle = Janus.Windows.GridEX.VisualStyle.Office2010;
           this.OfficeColorScheme = Janus.Windows.GridEX.OfficeColorScheme.Custom;
           this.ValueType = Janus.Windows.GridEX.NumericEditValueType.Int64;
           this.TextAlignment = Janus.Windows.GridEX.TextAlignment.Center;

           this.Enter += new System.EventHandler(this.NumericEditBoxBase_Enter);
           this.Leave += new System.EventHandler(this.NumericEditBoxBase_Leave);


           this.ResumeLayout(false);

       }

       private void NumericEditBoxBase_Enter(object sender, EventArgs e)
       {
           this.OfficeCustomColor = Color.Black;
           this.BackColor = Color.DimGray;
           this.ForeColor = Color.FromKnownColor(KnownColor.Window);
       }

       private void NumericEditBoxBase_Leave(object sender, EventArgs e)
       {
           this.OfficeCustomColor = Color.DimGray;
           this.BackColor = Color.FromKnownColor(KnownColor.Window);
           this.ForeColor = Color.FromKnownColor(KnownColor.WindowText);
       }
   }