Creating static Windows.Forms.Control

I have a project to which I delegate the function of creating a library of (static)? classes used in all my other projects. It is referenced via solution in these cases.

For instance, I have an extension which creates checkboxes within a given GroupBox's panel, and that works great:

public static void PreencheCheckboxesPanel(this Panel p, List<CheckBox> listaCheckBoxs) {
    var count = 0;
    listaCheckBoxs.ForEach(
        i => {
            i.Location = new Point(10, 10 + ((count) * 25)); //"dynamic" and not-so-effective resizing here
            i.AutoSize = true;
            count++;
        });
    p.Controls.AddRange(listaCheckBoxs.ToArray());
}}

Problem is, I need to insert a static checkbox on the top of the list, which will receive a method to (un)?check all the checkboxes below. So my code will become

public static void PreencheCheckboxesPanel(this Panel p, List<CheckBox> listaCheckBoxs) {
    var count = 0;
    if (adicionaAncora) {
        CKB_ancora.Text = textoAncora;
        CKB_ancora.CheckedChanged += (sender, args) => {
            ChecaCheckBoxes(p, CKB_ancora.Checked);
        };
        listaCheckBoxs.Insert(0, CKB_ancora);
    }
    listaCheckBoxs.ForEach(
        i => {
            i.Location = new Point(10, 10 + ((count) * 25)); //"dynamic" and not-so-effective resizing here
            i.AutoSize = true;
            count++;
        });
    p.Controls.AddRange(listaCheckBoxs.ToArray());
}}

where ChecaCheckBoxes is another

public static void ChecaCheckBoxes(this Panel b, bool checkStatus = true) {
    var listaCheckBoxs = (from Control c in b.Controls where c is CheckBox select (CheckBox)c).ToList();
    listaCheckBoxs.ForEach(
        i => {
            i.Checked = checkStatus;
        });
}

and CKB_ancora needs to be a solution-wide recognized object.

The reason? I have another extension named GetSelectedCheckBoxes which will be used to return all the checked ... ah... checkboxes within the groupbox. And, in order to make sure that the "anchor" (I call it like this, since I don't have a name to a (un)?check-all checkbox) won't be returned as well.

If I run this code, it will compile, but... will run accross an InvalidOperationException at Application.SetCompatibleTextRenderingDefault, right at Main(); Apparently, a control cannot be created/instantied before this method is run at mainpoint, which is the exact definition of "static".

Question: Knowing that I NEED a way to keep this particular check solution-wide visible... How do I do it?