how to resize a second window

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Xamarin

hi
im having trouble with this one tutorial,
its to create a login system . followed all instructions properly and so far everythings working except for the second form" dailog fragment" when i click the button it tries to open it , but it opens a small block with nothing on it , the block is about 1/20 from the main form, i went back and redone everything still the same problem ,
android:background="#DEDEDC"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:minWidth="300dp"
android:minHeight="400dp">
<edittext>
android:id="@+id/txtFirstName"
android:layout_width="match_parent"
android:layout_height="35dp"
android:removed="@drawable/edit_text_style"
android:layout_marginBottom="10dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="25dp"
android:hint="First Name"
android:paddingLeft="10dp"
android:textColor="#000" />
<edittext>
android:layout_below="@id/txtFirstName"
android:inputType="textEmailAddress"
android:layout_width="match_parent"
android:layout_height="35dp"
android:id="@+id/txtEmail"
android:removed="@drawable/edit_text_style"
android:layout_marginBottom="10dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:hint="Email"
android:paddingLeft="10dp"
android:textColor="#000" />
<edittext>
android:inputType="textPassword"
android:layout_width="match_parent"
android:layout_height="35dp"
android:id="@+id/txtPassword"
android:removed="@drawable/edit_text_style"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:hint="Password"
android:paddingLeft="10dp"
android:textColor="#000"
android:layout_below="@id/txtEmail" />
<relativelayout>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtPassword"
android:layout_marginTop="50dp">
<Button
android:text="Sign Up!"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnDialogEmail"
android:textSize="20dp"
android:textColor="#fff"
android:textStyle="bold"
android:paddingLeft="5dp"
android:paddingBottom="5dp"
android:paddingRight="5dp"
android:height="70dp"
android:paddingTop="2dp"
android:background="@drawable/ButtonSignUpStyle"
android:layout_centerHorizontal="true"
android:layout_marginLeft="30dp" />

tried posting it in code layout but it didnt want to show everything ,this is basicly the properties of the buttons and textfields of the "form" , thanks in advance
reply with a email address then i can send a screenshot :)