cierre completo de las ventanas

MenuPrincipal.cs

@@ -1,4 +1,5 @@
-using System;
+using compabetov2.database.modelos;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
@@ -19,10 +20,11 @@ namespace compabetov2
     public partial class MenuPrincipal : Form
     {
         private int childFormNumber = 0;
-
-        public MenuPrincipal()
+        private LoginModel loginPrincipal;
+        public MenuPrincipal(LoginModel loginPrincipal)
         {
             InitializeComponent();
+            this.loginPrincipal = loginPrincipal;
         }
 
        
@@ -65,16 +67,17 @@ namespace compabetov2
 
         private void button5_Click(object sender, EventArgs e)
         {
-            this.Dispose();
+            
 
                login login = new login();
-            login.Show();
+            login.ShowDialog();
+            this.Dispose();
         }
 
         private void pictureBox4_Click(object sender, EventArgs e)
         {
-            inventario inventario = new inventario();
-            inventario.Show();  
+            inventario inventario = new inventario(loginPrincipal);
+            inventario.ShowDialog();  
 
             this.Dispose(true);
 
@@ -87,34 +90,34 @@ namespace compabetov2
 
         private void pictureBox1_Click(object sender, EventArgs e)
         {
-            personal personal = new personal();
+            personal personal = new personal(loginPrincipal);
 
-            personal.Show();
+            personal.ShowDialog();
             this.Dispose(true);
 
         }
 
         private void pictureBox3_Click(object sender, EventArgs e)
         {
-            envios envios = new envios();
+            envios envios = new envios(loginPrincipal);
 
-            envios.Show();
+            envios.ShowDialog();
             this.Dispose(true);
 
         }
 
         private void pictureBox5_Click(object sender, EventArgs e)
         {
-            cuentas cuentas = new cuentas();
-            cuentas.Show();
+            cuentas cuentas = new cuentas(loginPrincipal);
+            cuentas.ShowDialog();
             this.Dispose(true);
 
         }
 
         private void pictureBox6_Click(object sender, EventArgs e)
         {
-            mermas mermas = new mermas();
-            mermas.Show();
+            mermas mermas = new mermas(loginPrincipal);
+            mermas.ShowDialog();
 
             this.Dispose(true);
 
@@ -127,8 +130,8 @@ namespace compabetov2
 
         private void pictureBox2_Click(object sender, EventArgs e)
         {
-            vender vender = new vender();
-            vender.Show();
+            vender vender = new vender(loginPrincipal);
+            vender.ShowDialog();
 
             this.Dispose(true);
         }
@@ -142,5 +145,10 @@ namespace compabetov2
         {
 
         }
+
+        private void panel1_Paint(object sender, PaintEventArgs e)
+        {
+
+        }
     }
 }