C# calling a form from another form

[dann11]

Hi! I am working on a project.. i want to call formA from formB, where formA also is link with a formC,

FormA

namespace Project
{
	/// <summary>
	/// Description of TargetActual.
	/// </summary>
	public partial class TargetActual : Form
	{
		MainForm main;
		Button ss;
					
		public TargetActual(MainForm m, object s)
		{
			main = m;
			ss = (Button) s;
			
			
			//
			// The InitializeComponent() call is required for Windows Forms designer support.
			//
			InitializeComponent();
			
			//
			// TODO: Add constructor code after the InitializeComponent() call.
			//
		}
}

FormB, i tried to call the formA through a button click:

public void getActualsettingForm(object sender, EventArgs e)
		{
			Actual m = new Actual(sender);
			m.ShowDialog();
		}

And with these I get an error of:

Project.Actual does not contain a constructor of that takes 1 arguments

How should I declare an argument if it is a form?