How to make a ToolStripMenuItem hold a variable value to be recalled later? - c++-cli

Question

I have a form that has a MenuStrip at the top. I only have one ToolStripMenuItem called Dates. I have written code that executes when an "Add" button is clicked which adds a new menu item underneath "Dates". This menu item is named by concatenating some variables which store user input. Here is everything I have for the "Add" button click event. It all works, but I want display the same info that gets displayed in the label when the click event happens to be saved to the submenu item too. So I want to be able to click that sub-menu item that is created and be able to see what input was saved to it when the Add button is clicked.
private: System::Void btnAdd_Click(System::Object^ sender, System::EventArgs^ e)
{
//add the input to the variables
String^ month = txtMonth->Text;
String^ day = txtDay->Text;
String^ year = txtYear->Text;
double tips = Double::Parse(txtTips->Text);
//make sure the date input is correct
if (txtMonth->Text == "" || txtDay->Text == "" || txtYear->Text == "" || Double::Parse(month) < 1 || Double::Parse(month) > 12
|| Double::Parse(day) < 1 || Double::Parse(day) > 31 /*|| Double::Parse(year)!=*/)
{
//show message box
MessageBox::Show("Please enter the date in the correct format.", "Error", MessageBoxButtons::OK,
MessageBoxIcon::Error);
//clear the boxes
txtMonth->Clear();
txtDay->Clear();
txtYear->Clear();
}
else
{
//for the menu bar
String^ date = month + "/" + day + "/" + year;
datesToolStripMenuItem->DropDownItems->Add(date)->Equals(date);
//print to label
lblPrint->Text = month + "/" + day + "/" + year + " - " + tips.ToString("c");
//clear the boxes
txtMonth->Clear();
txtDay->Clear();
txtYear->Clear();
txtTips->Clear();
}
}
FYI. I haven't written any code to do what I want to do. I just have no idea where to start for that, so I've shared what I have before that.