線を引くには？ Part2 (ID:69613)

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失礼しました。

グラフ表示がふたつありましたね。

一応、線を引くことができたのですが、Form1上に線を引いてしまいます。
Form2上に線はどのようにして引けばよいのでしょうか？

#pragma once

namespace test000000 {

using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

public ref class Form1 : public System::Windows::Forms::Form
	{
		public:
			Form1(void)
			{
				InitializeComponent();
			}

protected:
			~Form1()
			{
				if (components)
				{
					delete components;
				}
			}
		private: System::Windows::Forms::Button^  button1;
		protected:

private:
			System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
			void InitializeComponent(void)
			{
				this->button1 = (gcnew System::Windows::Forms::Button());
				this->SuspendLayout();
				// button1
				this->button1->Location = System::Drawing::Point(98, 100);
				this->button1->Name = L"button1";
				this->button1->Size = System::Drawing::Size(75, 23);
				this->button1->TabIndex = 0;
				this->button1->Text = L"グラフ表示";
				this->button1->UseVisualStyleBackColor = true;
				this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
				// Form1
				this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
				this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
				this->ClientSize = System::Drawing::Size(292, 266);
				this->Controls->Add(this->button1);
				this->Name = L"Form1";
				this->Text = L"Form1";
				this->ResumeLayout(false);

}
#pragma endregion
	
		//グラフ表示ボタン押下
		private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
			System::Windows::Forms::Form^ Form2 = gcnew Form;
			
			System::Windows::Forms::PictureBox^  pictureBox1;

pictureBox1 = gcnew PictureBox;

pictureBox1->Dock = DockStyle::Fill;
			pictureBox1->BackColor = Color::White;

pictureBox1->Paint += gcnew System::Windows::Forms::PaintEventHandler
				( this, &Form1::pictureBox1_Paint );

this->Controls->Add( pictureBox1 );

Form2->ShowIcon = false;
			Form2->MinimizeBox = false;
			Form2->MaximizeBox = false;

Form2->Text = L"GrapthShow";
			Form2->Width = 300;
			Form2->Height = 300;
			Form2->MinimumSize = System::Drawing::Size(300,300);
			Form2->MaximumSize = System::Drawing::Size(300,300);

Form2->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			Form2->Activate();
			Form2->Show();
			Form2->Refresh();
		}

void pictureBox1_Paint( Object^ , System::Windows::Forms::PaintEventArgs^ e )
		{
			Graphics^ g = e->Graphics;

g->DrawLine( System::Drawing::Pens::Red, 10,10,100,100 );
		}
	};
}

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