Okay Bonnie i am trying to implement this, but i am stumbling.

I have a form with a button on it. I want to override this buttons click event handler with my own.(btnOK)

I am not sure where to add the code, i don't have a base button i only have the button on the form to modify.

What code would i need if this was all on form and button.

this is the form code.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

using OakLeaf.MM.Main;
using OakLeaf.MM.Main.Business;
using OakLeaf.MM.Main.Windows.Forms;

using Apps4u.WinApp.Security;

namespace Apps4u.WinApp.Forms.Misc
{
	/// <summary>
	/// Summary description for UserLoginForm.
	/// </summary>
	public class a4uUserLoginForm : mmUserLoginForm
	{
		protected Apps4u.WinApp.Controls.Box_Items.a4uTextBox txtCompanyID;
		protected Apps4u.WinApp.Controls.Misc.a4uLabel lblCompanyID;

		public a4uUserLoginForm()  
		{
			InitializeComponent();						
		}
		
		//protected override void AuthenticateUser()
		//{
		//}

		#region FormElements
		private void InitializeComponent()
		{
			this.lblCompanyID = new Apps4u.WinApp.Controls.Misc.a4uLabel();
			this.txtCompanyID = new Apps4u.WinApp.Controls.Box_Items.a4uTextBox();
			this.grpLogin.SuspendLayout();
			// 
			// txtPassword
			// 
			this.txtPassword.Location = new System.Drawing.Point(120, 96);
			this.txtPassword.Name = "txtPassword";
			this.txtPassword.TabIndex = 2;
			// 
			// focusLoadControl
			// 
			this.focusLoadControl.Location = new System.Drawing.Point(120, 56);
			this.focusLoadControl.Name = "focusLoadControl";
			// 
			// lblPassword
			// 
			this.lblPassword.Location = new System.Drawing.Point(41, 98);
			this.lblPassword.Name = "lblPassword";
			this.lblPassword.TabIndex = 5;
			// 
			// lblUserID
			// 
			this.lblUserID.Location = new System.Drawing.Point(41, 58);
			this.lblUserID.Name = "lblUserID";
			this.lblUserID.TabIndex = 4;
			// 
			// grpLogin
			// 
			this.grpLogin.Controls.Add(this.txtCompanyID);
			this.grpLogin.Controls.Add(this.lblCompanyID);
			this.grpLogin.Location = new System.Drawing.Point(22, 16);
			this.grpLogin.Name = "grpLogin";
			this.grpLogin.Size = new System.Drawing.Size(300, 144);
			this.grpLogin.Controls.SetChildIndex(this.focusLoadControl, 0);
			this.grpLogin.Controls.SetChildIndex(this.lblCompanyID, 0);
			this.grpLogin.Controls.SetChildIndex(this.lblUserID, 0);
			this.grpLogin.Controls.SetChildIndex(this.lblPassword, 0);
			this.grpLogin.Controls.SetChildIndex(this.txtPassword, 0);
			this.grpLogin.Controls.SetChildIndex(this.txtCompanyID, 0);
			// 
			// btnCancel
			// 
			this.btnCancel.Name = "btnCancel";
			// 
			// btnOK
			// 
			this.btnOK.Name = "btnOK";
			this.btnOK.Click += new System.EventHandler(this.btnOK_Click);
			// 
			// lblCompanyID
			// 
			this.lblCompanyID.BindingSource = null;
			this.lblCompanyID.BindingSourceMember = null;
			this.lblCompanyID.ControlID = new System.Guid("00000000-0000-0000-0000-000000000000");
			this.lblCompanyID.Location = new System.Drawing.Point(41, 26);
			this.lblCompanyID.Name = "lblCompanyID";
			this.lblCompanyID.Size = new System.Drawing.Size(73, 16);
			this.lblCompanyID.TabIndex = 3;
			this.lblCompanyID.Text = "Company ID :";
			this.lblCompanyID.ToolTipText = null;
			// 
			// txtCompanyID
			// 
			this.txtCompanyID.BindingSource = null;
			this.txtCompanyID.BindingSourceMember = null;
			this.txtCompanyID.ControlID = new System.Guid("00000000-0000-0000-0000-000000000000");
			this.txtCompanyID.Format = null;
			this.txtCompanyID.FormatInfo = null;
			this.txtCompanyID.Location = new System.Drawing.Point(120, 24);
			this.txtCompanyID.Name = "txtCompanyID";
			this.txtCompanyID.NullText = "(null)";
			this.txtCompanyID.Size = new System.Drawing.Size(132, 20);
			this.txtCompanyID.TabIndex = 0;
			this.txtCompanyID.ToolTipText = null;
			// 
			// a4uUserLoginForm
			// 
			this.AcceptButton = null;
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.BackColor = System.Drawing.Color.Gray;
			this.CancelButton = null;
			this.ClientSize = new System.Drawing.Size(344, 222);
			this.Name = "a4uUserLoginForm";
			this.grpLogin.ResumeLayout(false);

		}
		#endregion

		public void btnOK_Click(object sender, System.EventArgs e)
		{
			bool lResult = this.Login_Click();
			if (!lResult)
				this.txtCompanyID.Focus();
		}
		public bool Login_Click()
		{
			// Change the cursor to an hourglass
			Cursor.Current = Cursors.WaitCursor;

			// Authenticate the user
			this.Authenticated = mmAppBase.UserMgr.AuthenticateUser(
				this.txtCompanyID.Text.Trim(),
				this.txtUserID.Text.Trim(),
				this.txtPassword.Text.Trim()
				);

			// Change the cursor back to its default
			Cursor.Current = Cursors.Default;
			
			string cFinalMessage = "";
			string CR = "\r" + "\n" ;
			
			if (!this.Authenticated)
			{
				// User not authenticated. Display the reason
				mmBusinessRule rules = mmAppBase.UserMgr.GetBusinessRuleObject();
				if (rules.BrokenRuleCount > 0)
				{

					for (int iMessage = 0; iMessage <= rules.BrokenRuleCount-1; iMessage++)
					{
						cFinalMessage += rules.GetBrokenRule(iMessage).Trim() + CR ;
					}

					if (mmAppBase.Localize)
						mmAppDesktop.MessageBox.Show(cFinalMessage, 
							"Login Error", 
							MessageBoxButtons.OK, 
							MessageBoxIcon.Warning,
							this.CurrentLanguage);
					else
						MessageBox.Show(cFinalMessage, 
							"Login Error", 
							MessageBoxButtons.OK, 
							MessageBoxIcon.Warning);

				}
			}
			return this.Authenticated;
		}
	}
}

Thanks