C#

internal Form1 From1
{
   get
   {
      if (this.from1 == null)
      {
         this.from1 = new Form1();

         this.from1.TopLevel = false; //HERE!!!!
         this.panel1.Controls.Add(this.from1);
         this.from1.Dock = DockStyle.Fill;
      }

      return this.from1;
   }
}

_mubashir wrote:

You can use public variable to which you can pass value

System.Diagnostics.Process.Start("C:\\Movies\\MyMovie.mpg");

[TypeConverter(typeof(ProgressStepConverter))]
public class ProgressStep
{
   public ProgressStep(Image image, string name, string description)
   {
      //...
   }

   //...
}

public class ProgressStepConverter : ExpandableObjectConverter
{	
   public override bool CanConvertTo(ITypeDescriptorContext context, Type destType) 
   {
      if (destType == typeof(InstanceDescriptor)) 
         return true;
      return base.CanConvertTo(context, destType);
   }

   public override object ConvertTo(ITypeDescriptorContext context, CultureInfo info, 
      object value, Type destType )
   {
      if (destType == typeof(InstanceDescriptor)) 
      {
         ProgressStep step = (ProgressStep)value;
         Type[] ctorTypes = new Type[] { typeof(Image), typeof(string), typeof(string) };
         object[] ctorParams = new object[] { step.Image, step.Name, step.Description };
         return new InstanceDescriptor(typeof(ProgressStep).GetConstructor(ctorTypes),
            ctorParams, true);
      }

      return base.ConvertTo(context, info, value, destType);
   }
}

bla.ProgressStep = new ExtendedPictureBoxLib.ProgressStep(
   null, "StepName", "Processing step \'{0}\' ({1}/{2})...")