If you set MinValue = MaxValue = 0, the editor allows the user to enter anything from 0.01 to 0.99.

The following code snippet demonstrates the issue:

private void InitializeComponent()
{
 this.ultraCurrencyEditor1 = new Infragistics.Win.UltraWinEditors.UltraCurrencyEditor();
 ((System.ComponentModel.ISupportInitialize)(this.ultraCurrencyEditor1)).BeginInit();
 this.SuspendLayout();
 //
 // ultraCurrencyEditor1
 //
 this.ultraCurrencyEditor1.Location = new System.Drawing.Point(44,71);
 this.ultraCurrencyEditor1.MaxValue = new decimal(new int[ {
        0,
        0,
        0,
        0});
 this.ultraCurrencyEditor1.MinValue = new decimal(new int[ {
        0,
        0,
        0,
        0});
 this.ultraCurrencyEditor1.Name = "ultraCurrencyEditor1";
 this.ultraCurrencyEditor1.Size = new System.Drawing.Size(143,21);
 this.ultraCurrencyEditor1.TabIndex = 0;
 //
 // Form1
 //
 this.AutoScaleDimensions = new System.Drawing.SizeF(6F,13F);
 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
 this.ClientSize = new System.Drawing.Size(612,518);
 this.Controls.Add(this.ultraCurrencyEditor1);
 this.Name = "Form1";
 this.Text = "Form1";
 ((System.ComponentModel.ISupportInitialize)(this.ultraCurrencyEditor1)).EndInit();
 this.ResumeLayout(false);
 this.PerformLayout();

}